This circuit, found in a 1964 US documentation, consists of a selective amplifier that lets only 10 Hz pass around a 400 Hz center frequency with the indicated components.
The A3906 integrated circuit from Allegro Microsystems (www.allegromicro.com) consists of a PWM...
This RF amplifier step has a dynamic range of 140 dB and can amplify signals from 0.5 to 40 MHz....
This circuit has a logarithmic response as a function of the light falling on the sensor. The...